Measurement of nanoscale surface roughness using electronic speckle pattern interferometer

In this article, we have reported surface roughness of silver nano particle treated handmade paper sheets using electronic speckle pattern interferometer (ESPI). Paper sheets are specially designed for showing antimicrobial activities. Surface roughness values of nano particle treated paper sheets were compared with untreated paper sheets. Typical surface roughness was found to be in range of 100-200 nm.